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The emails are sent at certain intervals. By default, the switch will email you 30, 45, and 52 days after you last showed signs of life. If you don't respond to any of those emails, all your messages will be sent 60 days after your last checkin. Of course, you can have your switch postpone its activation (if, for example, you'll be away for some time) by telling it to not try to contact you for a specified period of time. The service will resume normally after however many days have passed. In the default example, if you specify a delay of 10 days, the emails will be sent after 40, 55, and 62 days, while your messages will be sent after 70 days.